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Types of combustion of low nitrogen burners
- Author:Shenzhen Zhongli Weiye Electromechanical Equipment Co., Ltd.
- Origin:Shenzhen Zhongli Weiye Electromechanical Equipment Co., Ltd.
- Time of issue:2021-06-28 13:59
Types of combustion of low nitrogen burners
1. Stage burner
The stage burner designed according to the principle of staged combustion makes the fuel and air mix and burn in stages. Since the combustion deviates from the theoretical equivalence ratio, it can reduce the generation of nitrogen.
2. Self-recirculating burner
One is to use the pressure head of the combustion air to inhale part of the combustion flue gas, enter the burner, and mix and burn with the air. Due to flue gas recirculation, the heat capacity of the combustion flue gas is large, the combustion temperature is lowered, and the NOx is reduced. Another type of self-recirculating burner is to directly recirculate part of the flue gas in the burner and add it to the combustion process. This kind of burner has the dual effects of suppressing nitrogen oxides and saving energy.
3. Concentrated burner
The principle is to make part of the fuel burn too rich and the other part burn too lean, but the overall air volume remains unchanged. Since both parts are burned off-stoichiometric, the NOx is very low. This type of combustion is also known as off-stoichiometric or non-stoichiometric combustion.
4. Split flame burner
The principle is to divide a flame into several small flames. Due to the large heat dissipation area of the small flames and the lower flame temperature, the "thermal reaction NO" decreases. In addition, the small flame shortens the residence time of oxygen, nitrogen and other gases in the flame, and has obvious inhibitory effects on "thermal reaction NO" and "fuel NO".
5. Mixing-promoting burner
The residence time of the flue gas in the high temperature area is one of the main factors affecting the amount of NOx generation. Improving the mixing of combustion and air can reduce the thickness of the flame surface. Under the condition of constant combustion load, the flue gas is at high temperature on the flame surface. The residence time in the zone is shortened, thereby reducing the amount of NOx generated. Mixing-promoting burners are designed according to this principle.
6. Low nitrogen pre-combustion chamber burner
The pre-combustion chamber is a high-efficiency, low-nitrogen staged combustion technology developed and researched in China in the past 10 years. The pre-combustion chamber is generally composed of primary air (or secondary air) and a fuel injection system, and the fuel and primary air are rapidly mixed.
A fuel-rich mixture is formed in the primary combustion zone in the pre-combustion chamber. Due to lack of oxygen, only part of the fuel is burned, and the fuel precipitates volatiles in the primary flame zone with lean oxygen and lower flame temperature, thus reducing the generation of NOx.
The essence of any low-nitrogen combustion technology is to control the combustion process. According to 20 years of experience in the development and use of low-nitrogen burners, to achieve truly sustainable and reliable low-nitrogen combustion in industrial boilers, it is not enough to just replace or modify the burner, and it is also necessary to upgrade the combustion control device.
Shenzhen Zhongli Weiye Electromechanical Equipment Co., Ltd., on the basis of absorbing domestic and foreign advanced technology and craftsmanship, has accumulated many years of wisdom and experience in burners, and the accuracy, stability and reliability of products are in an important position in China. Our company produces Zhongli Weiye brand burner has been gradually upgraded from the first generation product to the current third generation product, and is still developing higher-end products. It is an advanced ultra-low nitrogen burner enterprise in China. With advanced technology, excellent quality and perfect service, our company's products rank in the forefront of the domestic super-burner industry, and have become a well-known domestic brand, with products all over the country, we actively advocate; market-oriented, scientific research The leader, with innovation as a means, actively explores domestic and foreign markets.
Web：www.szburners.comAddress: No. 2268, Longgang section, Longgang Avenue, Longgang District, Shenzhen
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